While doing an oil change, I removed the brake booster and master cylinder in attempt to find a leaking brake line. After getting it put back together, I started it and it immediately went into limp mode with a 2000 rpm limit. I can barely get the car to move. I ran ISTA diagnostics (limited, as I am also having issues getting ISTA to work correctly) but I did see that bank 1 idle actuator was stuck at 30% while bank 2 was behaving normally. Replaced both idle actuators. No change. Intensely inspected every millimeter of vacuum line I could visually, no obvious leaks. The line in the attached picture has no vacuum but I have not traced it to see if it should. The only thing I can think is that one of the throttle actuators has failed. After spending a couple dozen hours trying to diagnose this issue, its noteworthy that on 2 seperate attempts the car did not go into limp mode and I was able to rev over 2000 rpm. But the next time I started it, limp mode returned. I guess I will try the gear replacement on both actuators and see if that does anything. I appreciate any feedback...
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